Quote:
Fortunately, that's not how it works. The audio is left alone, and merely a gain control updated in the id3 tag. That's why it's such a better option, as the original audio isn't affected

Each MP3 audio frame has in its header a gain value which the decoder applies to the frame. The program goes through the file changing all these gain values (while leaving the rest of each frame alone -- that's what the FAQ answer is trying to say). I don't know why you don't perceive a difference in Itunes (perhaps it's using the tag data to undo the normalisation in favour of its own), but you certainly will on the car-player.

Peter